Channels 12-14 not available

I have pfSense 1.2.3 running on a PC Engines alix2d13 board, with a Compex WLM54GP23 wireless card. I configured it to be an access point, and it works, but I can only choose between channels 1-11. I live in Europe, where channels 12-13 are also used, and I know that there is also a channel 14, which is used in Japan. Is it a limitation in pfSense or a limitation in the card that prevents me from using channels 12-14?